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Ps Chapter 5
Vocab.
Term | Definition |
---|---|
Work | Transfer of energy that occurs when a force makes an object move;measured in joules |
Power | Amount of work done, or the amount of energy transferred, divided by the time required to do the work or transfer the energy; measured in watts |
Machine | Device that makes doing work easier by increasing the force applied to an object, changing the direction of the applied force increasing the distance over which a force can be applied |
Input Force | The force that is applied a machine |
Output Force | The force applied by the machine |
Mechanical Advantage | Ratio of the output force exerted by a machine to the input force applied to to the machine |
Efficiency | ratio of the output work done by the machine to the input work done on the machine, expressed as a percentage |
Simple Machine | Machine that does work with only one movement--lever pulley, wheel and axle, inclined plane, screw, and wedge. |
Lever | Simple Machine consisting of a bar bree to pivot about a fixed point called a fulcrum |
Pulley | Simple machine that consists of a grooved wheel with a rope, chain, or cable running along the groove; can be either fixed or moveable |
Wheel and Axle | Simple machine that consists of a shpft or axle attached to the center of a larger wheel so that the shaft and the wheel rotate together |
Inclined Plane | Simple machine that consists of a sloping surface, such as a ramp, that reduces the amount of force needed to lift something by increasing the distance over which the force is applied |
Screw | Simple machine that consists of an inclined plane wrapped in spiral around a cylindrical post |
Wedge | Simple machine that is an inclined plane with one or two sloping sides |
Compound Machine | Machine that is a combination of two or more simple machines |